### Home > APCALC > Chapter 9 > Lesson 9.3.1 > Problem9-83

9-83.

Multiple Choice: A projectile is launched vertically from the ground with an initial velocity of $50$ feet per second. Which of the following is closest to its maximum height?

1. $32$ ft

1. $39$ ft

1. $46$ ft

1. $50$ ft

1.  $128$ ft

Recall that gravitational acceleration is $a = -32$ ft/s.

$v(t)=\int{a(t)}dt$

In this situation, the maximum height occurs when the velocity is $0$.